llvm-mirror

mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-24 03:33:20 +01:00

History

Mikael Holmen 3a82bf8c1f [UnreachableBlockElim] Use COPY if PHI input is undef Summary: If we have %vreg0<def> = PHI %vreg2<undef>, <BB#0>, %vreg3, <BB#2>; GR32:%vreg0,%vreg2,%vreg3 %vreg3<def,tied1> = ADD32ri8 %vreg0<kill,tied0>, 1, %EFLAGS<imp-def>; GR32:%vreg3,%vreg0 then we can't just change %vreg0 into %vreg3, since %vreg2 is actually undef. We would have to also copy the undef flag to be able to change the register. Instead we deal with this case like other cases where we can't just replace the register: we insert a COPY. The code creating the COPY already copied all flags from the PHI input, so the undef flag will be transferred as it should. Reviewers: kparzysz Reviewed By: kparzysz Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D38235 llvm-svn: 314879		2017-10-04 06:06:31 +00:00
..
AArch64	MIR: Serialize CaleeSavedInfo Restored flag	2017-09-28 18:52:14 +00:00
AMDGPU	AMDGPU: Handle non-temporal loads and stores	2017-09-07 17:14:54 +00:00
ARM	[IfConversion] Add testcases [NFC]	2017-09-20 08:23:29 +00:00
Generic
Hexagon
Mips
NVPTX
PowerPC
X86	[UnreachableBlockElim] Use COPY if PHI input is undef	2017-10-04 06:06:31 +00:00
README

README

This directory contains tests for the MIR file format parser and printer. It
was necessary to split the tests across different targets as no single target
covers all features available in machine IR.

Tests for codegen passes should NOT be here but in test/CodeGen/sometarget. As
a rule of thumb this directory should only contain tests using
'llc -run-pass none'.